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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

3.9K
A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
3.9K
Thermometers and Temperature Scales01:22

Thermometers and Temperature Scales

8.3K
Any physical property that depends consistently and reproducibly on temperature can be used as the basis of a thermometer. For example, volume increases with temperature for most substances. This property is the basis for the common alcohol thermometer and the original mercury thermometers. Other properties used to measure temperature include electrical resistance, color, and the emission of infrared radiation.
As many physical properties depend on temperature, the variety of thermometers is...
8.3K
Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

2.0K
Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
2.0K
Gas Thermometers and the Kelvin Scale01:22

Gas Thermometers and the Kelvin Scale

7.1K
The definition of temperature in terms of molecular motion suggests that there should be a lowest possible temperature, where the average kinetic energy of molecules is zero (or the minimum allowed by quantum mechanics). Experiments confirm the existence of such a temperature, called absolute zero. An absolute temperature scale is one whose zero point is absolute zero. Such scales are convenient in science because several physical quantities, such as the volume of an ideal gas, are directly...
7.1K
Assessing Body Temperature - Tympanic membrane01:14

Assessing Body Temperature - Tympanic membrane

1.3K
Assessing tympanic membrane temperature involves using a tympanic membrane thermometer (TMT). Here is a step-by-step guide:
Step 1: Begin by practicing good hand hygiene to prevent the transmission of microorganisms.
Step 2: Turn on the thermometer and wait until the ready sign appears on the screen to ensure accurate measurement.
Step 3: Slide the probe cover in place to prevent cross-contamination.
Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...
1.3K
Assessing Body Temperature - Rectal01:27

Assessing Body Temperature - Rectal

14.4K
Rectal temperature measurement is considered the most precise method for assessing core body temperature and typically registers higher than oral temperature. For adults, the rectal thermometer should be inserted 1 to 1.5 inches into the rectum to obtain the most accurate reading.
Follow these steps for rectal temperature assessment:
Step 1: Perform hand hygiene and don clean gloves to prevent cross-infection.
Step 2: Position the patient in a side-lying position to better visualize the rectal...
14.4K

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Related Experiment Video

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Fabrication and Testing of Photonic Thermometers
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A SQUID-based primary noise thermometer for low-temperature metrology.

A Kirste1, J Engert2

  • 1Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, 10587 Berlin, Germany.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|February 24, 2016
PubMed
Summary

A new DC superconducting quantum interference device-based noise thermometer enables precise thermodynamic temperature measurements from 5 K down to 1 mK. This primary magnetic field fluctuation thermometer achieves a relative combined standard uncertainty of 0.6%.

Keywords:
PLTS-2000SQUIDsnoiseprimary thermometrytemperature scales

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Area of Science:

  • Physics
  • Metrology
  • Thermodynamics

Background:

  • Accurate temperature measurements are crucial for scientific advancement and require traceability to international standards.
  • The upcoming redefinition of the kelvin based on the Boltzmann constant necessitates advanced primary thermometry methods.
  • Existing methods face limitations in the broad temperature ranges required for fundamental research.

Purpose of the Study:

  • To develop and validate a novel DC superconducting quantum interference device-based noise thermometer.
  • To enable primary thermometry for the realization and dissemination of the kelvin.
  • To measure thermodynamic temperature accurately across a wide range, from 5 K down to below 1 mK.

Main Methods:

  • Development of a DC superconducting quantum interference device (SQUID) based noise thermometer.
  • Detailed description of the primary magnetic field fluctuation thermometer and its underlying thermodynamic temperature determination model.
  • Experimental validation through comparison with the Provisional Low Temperature Scale 2000 (PLTS-2000).

Main Results:

  • The developed thermometer successfully measures thermodynamic temperature in the range of 0.7 K to 16 mK.
  • Experimental results show excellent agreement with the PLTS-2000.
  • A relative combined standard uncertainty of 0.6% was achieved for the thermodynamic temperature measurements.

Conclusions:

  • The DC SQUID-based noise thermometer is a viable primary thermometry technique for realizing and disseminating the kelvin.
  • This instrument provides accurate thermodynamic temperature measurements in the millikelvin range with low uncertainty.
  • The findings support the transition to a new SI definition of temperature based on fundamental constants.